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Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?

1. (a) Parathormone – Calcitonin
2. (b) Insulin – Glucagon
3. (c) Aldosterone – Atrial Natriuretic Factor
4. (d) Relaxin – Inhibin

Correct answer: (d) Relaxin – Inhibin

Solution

Relaxin and inhibin are not antagonistic because they do not have opposite actions on the same target process. Relaxin helps relax pelvic ligaments and soften the cervix, while inhibin mainly suppresses FSH secretion.

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